<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>053-盒子阴影.html</title>
	<style>
		*{
			margin: 0;
			padding: 0;
		}
		div{
			width: 500px;
			height: 500px;
			border: 1px solid #000;
			margin: 100px auto;
			/*background-color: #cf1800;*/
			box-shadow: 10px 10px 10px 10px yellow;
		}	
		div:hover{
			box-shadow: 5px 5px 5px 5px ;
		}
	</style>
</head>
<body>
	<div>hi</div>
</body>
</html>